#include "v3p_f2c.h"
#include "fio.h"
#include "string.h"
#ifndef NON_POSIX_STDIO
#ifdef MSDOS
#include "io.h"
#else
#include "unistd.h"     /* for access */
#endif
#endif

#ifdef KR_headers
extern char *malloc();
#ifdef NON_ANSI_STDIO
extern char *mktemp();
#endif
extern integer f_clos();
#else
#undef abs
#undef min
#undef max
#include "stdlib.h"
#ifdef __cplusplus
extern "C" {
#endif
extern int f__canseek(FILE*);
extern integer f_clos(cllist*);
#endif

#ifdef NON_ANSI_RW_MODES
char *f__r_mode[2] = {"r", "r"};
char *f__w_mode[4] = {"w", "w", "r+w", "r+w"};
#else
char *f__r_mode[2] = {"rb", "r"};
char *f__w_mode[4] = {"wb", "w", "r+b", "r+"};
#endif

 static char f__buf0[400], *f__buf = f__buf0;
 int f__buflen = (int)sizeof(f__buf0);

 static void
#ifdef KR_headers
f__bufadj(n, c) int n, c;
#else
f__bufadj(int n, int c)
#endif
{
        unsigned int len;
        char *nbuf, *s, *t, *te;

        if (f__buf == f__buf0)
                f__buflen = 1024;
        while(f__buflen <= n)
                f__buflen <<= 1;
        len = (unsigned int)f__buflen;
        if (len != f__buflen || !(nbuf = (char*)malloc(len)))
                f__fatal(113, "malloc failure");
        s = nbuf;
        t = f__buf;
        te = t + c;
        while(t < te)
                *s++ = *t++;
        if (f__buf != f__buf0)
                free(f__buf);
        f__buf = nbuf;
        }

 int
#ifdef KR_headers
f__putbuf(c) int c;
#else
f__putbuf(int c)
#endif
{
        char *s, *se;
        int n;

        if (f__hiwater > f__recpos)
                f__recpos = f__hiwater;
        n = f__recpos + 1;
        if (n >= f__buflen)
                f__bufadj(n, f__recpos);
        s = f__buf;
        se = s + f__recpos;
        if (c)
                *se++ = c;
        *se = 0;
        for(;;) {
                fputs(s, f__cf);
                s += strlen(s);
                if (s >= se)
                        break;  /* normally happens the first time */
                putc(*s++, f__cf);
                }
        return 0;
        }

 void
#ifdef KR_headers
x_putc(c)
#else
x_putc(int c)
#endif
{
        if (f__recpos >= f__buflen)
                f__bufadj(f__recpos, f__buflen);
        f__buf[f__recpos++] = c;
        }

#define opnerr(f,m,s) {if(f) errno= m; else opn_err(m,s,a); return(m);}

 static void
#ifdef KR_headers
opn_err(m, s, a) int m; char *s; olist *a;
#else
opn_err(int m, char *s, olist *a)
#endif
{
        if (a->ofnm) {
                /* supply file name to error message */
                if (a->ofnmlen >= f__buflen)
                        f__bufadj((int)a->ofnmlen, 0);
                g_char(a->ofnm, a->ofnmlen, f__curunit->ufnm = f__buf);
                }
        f__fatal(m, s);
        }

#ifdef KR_headers
integer f_open(a) olist *a;
#else
integer f_open(olist *a)
#endif
{       unit *b;
        integer rv;
        char buf[256], *s;
        cllist x;
        int ufmt;
        FILE *tf;
#ifndef NON_UNIX_STDIO
        int n;
#endif
        f__external = 1;
        if(a->ounit>=MXUNIT || a->ounit<0)
                err(a->oerr,101,"open")
        if (!f__init)
                f_init();
        f__curunit = b = &f__units[a->ounit];
        if(b->ufd) {
                if(a->ofnm==0)
                {
                same:   if (a->oblnk)
                                b->ublnk = *a->oblnk == 'z' || *a->oblnk == 'Z';
                        return(0);
                }
#ifdef NON_UNIX_STDIO
                if (b->ufnm
                 && strlen(b->ufnm) == a->ofnmlen
                 && !strncmp(b->ufnm, a->ofnm, (unsigned)a->ofnmlen))
                        goto same;
#else
                g_char(a->ofnm,a->ofnmlen,buf);
                if (f__inode(buf,&n) == b->uinode && n == b->udev)
                        goto same;
#endif
                x.cunit=a->ounit;
                x.csta=0;
                x.cerr=a->oerr;
                if ((rv = f_clos(&x)) != 0)
                        return rv;
                }
        b->url = (int)a->orl;
        b->ublnk = a->oblnk && (*a->oblnk == 'z' || *a->oblnk == 'Z');
        if(a->ofm==0)
        {       if(b->url>0) b->ufmt=0;
                else b->ufmt=1;
        }
        else if(*a->ofm=='f' || *a->ofm == 'F') b->ufmt=1;
        else b->ufmt=0;
        ufmt = b->ufmt;
#ifdef url_Adjust
        if (b->url && !ufmt)
                url_Adjust(b->url);
#endif
        if (a->ofnm) {
                g_char(a->ofnm,a->ofnmlen,buf);
                if (!buf[0])
                        opnerr(a->oerr,107,"open")
                }
        else
                sprintf(buf, "fort.%ld", (long)a->ounit);
        b->uscrtch = 0;
        b->uend=0;
        b->uwrt = 0;
        b->ufd = 0;
        b->urw = 3;
        switch(a->osta ? *a->osta : 'u')
        {
        case 'o':
        case 'O':
#ifdef NON_POSIX_STDIO
                if (!(tf = FOPEN(buf,"r")))
                        opnerr(a->oerr,errno,"open")
                fclose(tf);
#else
                if (access(buf,0))
                        opnerr(a->oerr,errno,"open")
#endif
                break;
         case 's':
         case 'S':
                b->uscrtch=1;
#ifdef NON_ANSI_STDIO
                (void) strcpy(buf,"tmp.FXXXXXX");
                (void) mktemp(buf);
                goto replace;
#else
                if (!(b->ufd = tmpfile()))
                        opnerr(a->oerr,errno,"open")
                b->ufnm = 0;
#ifndef NON_UNIX_STDIO
                b->uinode = b->udev = -1;
#endif
                b->useek = 1;
                return 0;
#endif

        case 'n':
        case 'N':
#ifdef NON_POSIX_STDIO
                if ((tf = FOPEN(buf,"r")) || (tf = FOPEN(buf,"a"))) {
                        fclose(tf);
                        opnerr(a->oerr,128,"open")
                        }
#else
                if (!access(buf,0))
                        opnerr(a->oerr,128,"open")
#endif
                /* no break */
        case 'r':       /* Fortran 90 replace option */
        case 'R':
#ifdef NON_ANSI_STDIO
 replace:
#endif
                if (tf = FOPEN(buf,f__w_mode[0]))
                        fclose(tf);
        }

        b->ufnm=(char *) malloc((unsigned int)(strlen(buf)+1));
        if(b->ufnm==NULL) opnerr(a->oerr,113,"no space");
        (void) strcpy(b->ufnm,buf);
        if ((s = a->oacc) && b->url)
                ufmt = 0;
        if(!(tf = FOPEN(buf, f__w_mode[ufmt|2]))) {
                if (tf = FOPEN(buf, f__r_mode[ufmt]))
                        b->urw = 1;
                else if (tf = FOPEN(buf, f__w_mode[ufmt])) {
                        b->uwrt = 1;
                        b->urw = 2;
                        }
                else
                        err(a->oerr, errno, "open");
                }
        b->useek = f__canseek(b->ufd = tf);
#ifndef NON_UNIX_STDIO
        if((b->uinode = f__inode(buf,&b->udev)) == -1)
                opnerr(a->oerr,108,"open")
#endif
        if(b->useek)
                if (a->orl)
                        rewind(b->ufd);
                else if ((s = a->oacc) && (*s == 'a' || *s == 'A')
                        && FSEEK(b->ufd, 0L, SEEK_END))
                                opnerr(a->oerr,129,"open");
        return(0);
}

 int
#ifdef KR_headers
fk_open(seq,fmt,n) ftnint n;
#else
fk_open(int seq, int fmt, ftnint n)
#endif
{       char nbuf[10];
        olist a;
        (void) sprintf(nbuf,"fort.%ld",(long)n);
        a.oerr=1;
        a.ounit=n;
        a.ofnm=nbuf;
        a.ofnmlen=strlen(nbuf);
        a.osta=NULL;
        a.oacc= (char*)(seq==SEQ?"s":"d");
        a.ofm = (char*)(fmt==FMT?"f":"u");
        a.orl = seq==DIR?1:0;
        a.oblnk=NULL;
        return(f_open(&a));
}
#ifdef __cplusplus
}
#endif
